How to introduce random material offset and rotation to array modifier created objects in 2.81?
This is video what helped me. The Array modifier creates a copy of an object, which behaves exactly as its origin. So you should also see this answer.
Apply the modifier to make the data real.
Enter Edit Mode on the object and press P  &gt; Separate by loose parts.
Select all separated objects and press Shift + Ctrl + Alt + C  &gt; Origin to Geometry.
This will make each piece an individual object with the origin located at the origin of the original object. Now you can manipulate them as you wish.